android listview loadmore button with xml parsing
- by user1780331
Hi i have to developed listview with load more button using xml parsing in android application.
Here i have faced some problem.
my xml feed is empty means how can hide the load more button on last page.
i have used below code here.
public class CustomizedListView extends Activity {
// All static variables
private String URL = "http://dev.mmm.com/xctesting/xcart444pro/retrieve.php?page=1";
// XML node keys
static final String KEY_SONG = "Order";
static final String KEY_TITLE = "orderid";
static final String KEY_DATE = "date";
static final String KEY_ARTIST = "payment_method";
int current_page = 1;
ListView lv;
LazyAdapter adapter;
ProgressDialog pDialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lv = (ListView) findViewById(R.id.list);
ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML from URL
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_SONG);
// looping through all song nodes <song>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
songsList.add(map);
}
Button btnLoadMore = new Button(this);
btnLoadMore.setText("Load More");
btnLoadMore.setBackgroundResource(R.drawable.lgnbttn);
// Adding Load More button to lisview at bottom
lv.addFooterView(btnLoadMore);
// Getting adapter
adapter = new LazyAdapter(this, songsList);
lv.setAdapter(adapter);
btnLoadMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// Starting a new async task
new loadMoreListView().execute();
}
});
}
private class loadMoreListView extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
// Showing progress dialog before sending http request
pDialog = new ProgressDialog(
CustomizedListView.this);
pDialog.setMessage("Please wait..");
//pDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.my_progress_indeterminate));
pDialog.setIndeterminate(true);
pDialog.setCancelable(false);
pDialog.show();
pDialog.setContentView(R.layout.custom_dialog);
}
protected Void doInBackground(Void... unused) {
current_page += 1;
// Next page request
URL = "http://dev.mmm.com/xctesting/xcart444pro/retrieve.php?page=" + current_page;
ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML from URL
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_SONG);
NodeList nl = doc.getElementsByTagName(KEY_SONG);
if (nl.getLength() == 0)
{
btnLoadMore.setVisibility(View.GONE);
pDialog.dismiss();
}
else
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
songsList.add(map);
}
// get listview current position - used to maintain scroll position
int currentPosition = lv.getFirstVisiblePosition();
// Appending new data to menuItems ArrayList
adapter = new LazyAdapter(
CustomizedListView.this,
songsList);
lv.setAdapter(adapter);
lv.setSelectionFromTop(currentPosition + 1, 0);
}
});
return (null);
}
protected void onPostExecute(Void unused) {
// closing progress dialog
pDialog.dismiss();
}
}
}
EDIT:
Here i have to run the app means the listview is displayed on perpage 4 items.my last page having 1 item.please refer this screenshot:http://screencast.com/t/fTl4FETd
In last page i have to click the load more button means have to go next activity and successfully hide the button on empty page..please refer this screenshot:http://screencast.com/t/wyG5zdp3r
i have to check the condition for empty page:
if (nl.getLength() == 0)
{
btnLoadMore.setVisibility(View.GONE);
pDialog.dismiss();
}
How can i write the conditon fot last page?????pleas ehelp me
Here i wish to need the o/p is hide the button on last page.
Please help me.how can i check the condition.give me some code programmatically.
